US3547813A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Biochemical oxidation with low sludge recycle
Assignee: Linde GmbH
•
Filing: 1969-07-02
•
Granted: 1970-12-15
•
Expires: 1989-07-02
Abstract
No abstract record available.
Inventors
- 👤 Ernest K Robinson
- 👤 John R Mcwhirter
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 01:01
CPC Classifications
C; C02; C02F; C02F3/00; C02F3/02; C02F3/12; C02F3/26; Y; Y02; Y02W; Y02W10/00; Y02W10/10
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2380465A
Cited
US3054602A
Cited
US3412017A
Cited
US3342727A
Cited
US3356609A
Cited
US3401113A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1973-12-14 | 1974-06-15 | 1974-12-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-12-14 | 1978-06-15 | 1978-12-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-12-14 | 1982-06-15 | 1982-12-15 | $7700.00 | Window Closed / Lapsed |